I live in the burbs with some amenities being walking distance. People are still very isolated and segregated. I'm not sure it can be fixed except to allow easy access through public transportation to more dense, walkable areas. Strong driving culture as well. Save for a few strip malls on main drags, suburbia is a big box dystopia. Anyway yes zoning is probably the most important thing, though people are out here for the (comparatively) larger lots and houses.